BenQ DC C30 vs. BenQ DC C35

Comparison

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BenQ DC C30

BenQ DC C35

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Megapixels

3.34

3.21

Max. image resolution

2304 x 1728

2048 x 1536

Sensor

Sensor type

CCD

CMOS

Sensor size

1/2.5" (~ 5.75 x 4.32 mm)

Sensor resolution

2108 x 1585

2067 x 1554

Diagonal

7.19 mm

Sensor size comparison

Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality.

Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.

Learn more about sensor sizes »

Actual sensor size

Note: Actual size is set to screen → change »

	vs
1	:	1
(ratio)

BenQ DC C30		BenQ DC C35

Surface area:

24.84 mm²

Difference: 0 mm² (0%)

DC C30 and DC C35 sensors are the same size.

Pixel pitch

2.73 µm

2.78 µm

Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.

The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.

Difference: 0.05 µm (2%)

Pixel pitch of DC C35 is approx. 2% higher than pixel pitch of DC C30.

Pixel area

7.45 µm²

7.73 µm²

Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel.

Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.

Relative pixel sizes:

Pixel area difference: 0.28 µm² (4%)

A pixel on BenQ DC C35 sensor is approx. 4% bigger than a pixel on BenQ DC C30.

Pixel density

13.44 MP/cm²

12.92 MP/cm²

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor.

Higher pixel density means smaller pixels and lower pixel density means larger pixels.

Difference: 0.52 µm (4%)

BenQ DC C30 has approx. 4% higher pixel density than BenQ DC C35.

To learn about the accuracy of these numbers, click here.

Specs

BenQ DC C30

BenQ DC C35

Crop factor

6.02

Total megapixels

Effective megapixels

Optical zoom

Yes

Digital zoom

Yes

ISO sensitivity

Auto

RAW

Manual focus

Normal focus range

50 cm

120 cm

Macro focus range

10 cm

30 cm

Focal length (35mm equiv.)

35 - 98 mm

43 mm

Aperture priority

Max. aperture

f2.6 - f4.9

Max. aperture (35mm equiv.)

f15.7 - f29.5

f18.1

Metering

Multi-pattern, Spot

Centre weighted, Spot

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

8 sec

1/6 sec

Max. shutter speed

1/2000 sec

1/1000 sec

Built-in flash

External flash

Viewfinder

Optical

White balance presets

Screen size

1.6"

1.5"

Screen resolution

Video capture

Max. video resolution

Storage types

Secure Digital

USB

USB 1.1

HDMI

Wireless

GPS

Battery

2x AA

Li-Ion

Weight

147 g

144 g

Dimensions

92 x 62.2 x 31.5 mm

98 x 58 x 27 mm

Year

2004

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Diagonal

Diagonal is calculated by the use of Pythagorean theorem:

Diagonal = √

w² + h²

where w = sensor width and h = sensor height

BenQ DC C30 diagonal

The diagonal of DC C30 sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm

Diagonal = √

5.75² + 4.32²

= 7.19 mm

BenQ DC C35 diagonal

The diagonal of DC C35 sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm

Diagonal = √

5.75² + 4.32²

= 7.19 mm

Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

DC C30 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

DC C35 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

Pixel pitch

Pixel pitch is the distance from the center of one pixel to the center of the next measured in micrometers (µm). It can be calculated with the following formula:

Pixel pitch =	sensor width in mm	× 1000
	sensor resolution width in pixels

DC C30 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2108 pixels

Pixel pitch =	5.75	× 1000	= 2.73 µm
	2108

DC C35 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2067 pixels

Pixel pitch =	5.75	× 1000	= 2.78 µm
	2067

Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:

Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:

Pixel area =	sensor surface area in mm²
	effective megapixels

DC C30 pixel area

Pixel pitch = 2.73 µm

Pixel area = 2.73² = 7.45 µm²

DC C35 pixel area

Pixel pitch = 2.78 µm

Pixel area = 2.78² = 7.73 µm²

Pixel density

Pixel density can be calculated with the following formula:

Pixel density = (	sensor resolution width in pixels	)² / 1000000
	sensor width in cm

One could also use this formula:

Pixel density =	effective megapixels × 1000000	/ 10000
	sensor surface area in mm²

DC C30 pixel density

Sensor resolution width = 2108 pixels
Sensor width = 0.575 cm

Pixel density = (2108 / 0.575)² / 1000000 = 13.44 MP/cm²

DC C35 pixel density

Sensor resolution width = 2067 pixels
Sensor width = 0.575 cm

Pixel density = (2067 / 0.575)² / 1000000 = 12.92 MP/cm²

Sensor resolution

Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher than maximum (not interpolated) image resolution which is usually stated on camera specifications. Sensor resolution is used in pixel pitch, pixel area, and pixel density formula. For sake of simplicity, we're going to calculate it in 3 stages.

1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.

2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:

(X × r) × X = effective megapixels × 1000000 →

X = √	effective megapixels × 1000000
	r

3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

DC C30 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 3.34

r = 5.75/4.32 = 1.33

X = √	3.34 × 1000000	= 1585
	1.33

Resolution horizontal: X × r = 1585 × 1.33 = 2108
Resolution vertical: X = 1585

Sensor resolution = 2108 x 1585

DC C35 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 3.21

r = 5.75/4.32 = 1.33

X = √	3.21 × 1000000	= 1554
	1.33

Resolution horizontal: X × r = 1554 × 1.33 = 2067
Resolution vertical: X = 1554

Sensor resolution = 2067 x 1554

Crop factor

Crop factor or focal length multiplier is calculated by dividing the diagonal of 35 mm film (43.27 mm) with the diagonal of the sensor.

Crop factor =	43.27 mm
	sensor diagonal in mm

DC C30 crop factor

Sensor diagonal in mm = 7.19 mm

Crop factor =	43.27	= 6.02
	7.19

DC C35 crop factor

Sensor diagonal in mm = 7.19 mm

Crop factor =	43.27	= 6.02
	7.19

35 mm equivalent aperture

Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier).

DC C30 equivalent aperture

Crop factor = 6.02
Aperture = f2.6 - f4.9

35-mm equivalent aperture = (f2.6 - f4.9) × 6.02 = f15.7 - f29.5

DC C35 equivalent aperture

Crop factor = 6.02
Aperture = f3

35-mm equivalent aperture = (f3) × 6.02 = f18.1

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